North Korea media reporting its leader Kim Jong Un has just convened an urgent military meeting at its Supreme Command.
"The time has come to settle accounts with the U.S.," Kim said, according to North Korean state media.
North Korea ordered rockets to be on standby for firing at U.S. targets.
These latest moves are in retaliation to the U.S. flying two B-2 Spirit bombers over South Korea. It was a training exercise but also meant as forceful signal to North Korea.
The stealth bombers are capable of carrying both conventional and nuclear weapons. They flew more than 6,500 miles from Missouri to South Korea.
U.S. Forces in Korea say the mission "demonstrates the United States ability to conduct long-range, precision strikes quickly and at will."
OutFront tonight: Pentagon Press Secretary George Little.